140 LIFE OF in. the critical moment, when France and Prussia had been momentarily disturbed in their friendly relations, as the most fitting mediator between two nations who were both proud of him. Therefore., King Frederick William III. sent Humboldt to Paris, in September, 1830, with the diplomatic mission to acknowledge King Louis Philippe, and the new dynasty; and iu February,, 1831, he was again sent thither oil a diplo- matic mission, while his brother William was also at this time summoned from his private position, and by the decoration of the order of the Black Eagle, and admission, into the Council of State, received—as Alexander said a few days before his departure for Paris (on the 26th of September, 1830)—a kind of compensation for the former slights of the Chancellor Hardenberg. It is very probable that Alexander von. Humboldt availed himself of his confidential position with the king, to speak of his brother William to him, and to bring about this restitution. Henceforward the brothers lived quite for each other, and their social, as well as their intellectual joys, flowed from the common fount of love. The exchange of their ideas was now a personal, direct one, and the former long separations were compen- sated by the most intimate interchange of knowledge and of feelings. We quote what the biographer of William von Humboldt (G. Schlesier) says on this subject: " William now had his brother Alexander constantly with him; and how much had they not to speak who had been so long separated, and who, for reasons which may be easily imagined, could not even express their affection in writing. The letters they interchanged were rare and barren, like a landscape without water or vegetation; for, as is generally the case, they did not even communicate to each other what they might unhesitatingly have written. What must have been William's joy at the return of Ms brother, and when he saw him, the younger and stronger one, advance gloriously on his career. We know how their studies had always been in common.